The Study On The Fatigue Crack Nitiation And Propagation Life Prediction Of Rail

With China’s rapid economic development, the increasing number of private cars, causing traffic jams of the large and medium-sized cities. Although there are now some measures to control the growth in vehicle, but the vehicle is still on the rise. The vehicle increasing demand for parking spaces also increases. However, due to the the the shortage of of the land resources in the the city, unable to provide the the Parking position of the more, formed a the demand for land resources contradictions in the the city, the formation of difficult problem of parking. Need to find a way to improve the way of the number of parking per unit area to become the key to solve the problem.Through analysis and comparison of advantages and disadvantages between different types of three-dimensional garage, considering the advantages of various stereo garage and its own characteristics, to establish a three-dimensional garage vertical cyclic lateral translation, access the vehicle can effectively shorten the time of three-dimensional garage, and enhance the unit area of the parking quantity, convenient implementation process the car. Then by using ANSYS APDL language to establish the finite element model of vertical circular transverse translation stereo garage, which uses a beam element, element and mass element. Modal analysis of steel structure and steel tube concrete structure of granulation tower, the first twenty frequencies and corresponding vibration modes, and carries on the contrast analysis, three-dimensional garage in the sensitive frequency obtained under different conditions.In order to ensure the reliability of stereo garage, according to the national standard of "standard" architectural structure load of provisions of the stereo garage under wind load stability analysis. In stereo garage in different height, according to the basic wind pressure between different surface wind speed and the building, at the same time, considering the relationship between the wind load wind vibration coefficient, and specific height at which the wind load shape coefficient, wind pressure height variation coefficient and basic wind pressure applied standard value, can be given to the construction of surface wind pressure under the conditions of different wind scale applying the method, the method for the innovation of the paper.At the same time, according to building structure seismic code provisions for seismic performance test, through the design of the stereo garage, using the "Regulations" code for seismic design of building structure in the evaluation of the stereo garage. Seismic calculation using the time-history analysis, spectrum analysis and earthquake, in the process of calculation into larger acceleration EL-CENTRO wave, the better to ensure the safety of structure.